On normalizations of Thurston measure on the space of measured laminations

The space of measured laminations $\mathcal{ML}(\Sigma)$ associated to a topological surface $\Sigma$ of genus $g$ with $n$ punctures is an integral piecewise linear manifold of real dimension $6g-6+2n$. There is also a natural symplectic structure on $\mathcal{ML}(\Sigma)$ defined by Thurston. The integral and symplectic structures define a pair of measures on $\mathcal{ML}(\Sigma)$ which are known to be proportional. The projective class of these measures on $\mathcal{ML}(\Sigma)$ is called the Thurston measure. In this note we compute the ratio between two normailzations of the Thurston measure.